exactly. It may not look like much, but it does a very important and vital service. There is a reason why they were invented/introduced.
End of the day, yep, you can put a tubeless on a tubed rim and either run it with a tube or without.
however, you do run the risk of a tyre rolling off the rim, and your insurer telling you to take a hike, if that contributed to the accident.
Your choice.

